Ghetto slang for a dress made of sequined fabric. I first heard this used on Ru Paul's Drag Race when trashy queen Roxy Andrews said she was planning on wearing a "sequence dress" clearly meaning a dress with sequins. Right. At first I assumed Roxy was just a bit thick in the head, but not long after, I heard a friend of mine with somewhat similar background use the exact same expression/mispronunciation.

English speaker: "Do you mean a dress with sequins?"
Under-educated Drag Queen: "Bitch, what you talk'in? One sequence, two sequence. You know, a sequence dress. Hello?!"
English speaker: "Yeah, the word is SEQUIN. One sequin, two sequins, a sequined gown."
Under-educated Drag Queen: "Why you throw'in shade bitch? I'll cut you!"
English speaker: "What?"
Under-educated Drag Queen: "We're through, lady. I don't need you getting in the way of my fabulous ass. This bitch is serving fish, hunty."